# -*- coding: utf-8 -*-
"""
Created on Fri May 17 15:34:45 2024

@author: Administrator
"""

from kou_5_17_zuoye import is_prime

n = int(input("输入一个正整数："))
flag = is_prime(n)

if flag:
   print(n,'是素数')
else:
   print(n,'不是素数')